Improvement in sewing-machine driving-wheels



A. w'. SAWYER'.

Improvemefit in Sewing-Machine Driving-Wheels..

Patented June 4, [872.

INVEUNTOR WiTNESS.

UNITED STATES PATENT CFFICE.

ABNER \V. SAWYER, OF CLEVELAND, OHIO.

Specification forming part'of Letters Patent No. 127,434, dated June 4, 1872.

SPECIFICATION.

.treadle; hence the necessity of this attachment to adapt the Sapp treadle to machines,

as aforesaid.

In the drawing, Figure 1 is a plan of a sewing-machine wheel having my improvement attached. Fig. 2 is a detached view of my improved crank-shortener.

A, Fig. 1, represents a sewing-machine driving-wheel. B, Figs. land 2, represents a bar of iron having an eye in each end, one of which fits over the hub O of the wheel A, the other over the Wrist-pin stud D, and is secured in place by set-screws e e. The wrist-pin E, on which the pitman plays, is screwed'into the bar B a short distance from the stud, by which the distance from the center of the hub O and the wrist-pin is shortened, thus shortening the crank, and thereby shortening the stroke of the pitman; the object of this being, as aforesaid, to adapt certain machines to the Sapp alternateinotion treadle.

The bar B, having the eyes or slots in the ends, and the pin E, in combination with the hub U and wrist-pin stud D of a sewing-Inachine driving-wheel, as shown and described, and for the purpose set forth.

ABNER W. SAWYER.

Witnesses GEO. W. TrBBITTs, STILEs H. CURTISS. 

